When auth fails during nuget stats, render failure

It can be helpful to see the actual error from the GH CLI when authentication fails. We only propagate the error as the output to the caller from our process helper if there was no output already (i.e. some graphql APIs return failure but still provide data). This eliminates the chance of breaking existing code that relied on that.

Also added a debug-only option to pass in a direct token, which is easier for debug runs of the CLI.

src/Commands/GitHub.cs

@@ -116,6 +116,10 @@ class TransientToken : IDisposable
             if (!TryExecute("gh", $"auth login --with-token", token, out var output))
             {
                 Debug.Fail(output);
+                AnsiConsole.MarkupLine("[red]Failed to authenticate with provided token[/]");
+                if (output.Trim().Length > 0)
+                    AnsiConsole.MarkupLine($"[dim]{output.Trim()}[/]");
+
                 return null;
             }
 

src/Commands/NuGetStatsCommand.cs

@@ -58,6 +58,12 @@ public class NuGetStatsSettings : ToSSettings
         [CommandOption("--with-token")]
         public bool WithToken { get; set; }
 
+#if DEBUG
+        [Description(@"Specific GitHub authentication token for debug")]
+        [CommandOption("--token")]
+        public string? Token { get; set; }
+#endif
+
         [Description("Pages to skip")]
         [CommandOption("--skip", IsHidden = true)]
         public int Skip { get; set; }
@@ -92,13 +98,17 @@ public override ValidationResult Validate()
     public override async Task<int> ExecuteAsync(CommandContext context, NuGetStatsSettings settings)
     {
         string? token = default;
+#if DEBUG
+        token = settings.Token;
+#endif
         if (settings.WithToken)
             token = new StreamReader(Console.OpenStandardInput()).ReadToEnd().Trim();
 
         using var withToken = GitHub.WithToken(token);
-        if (!string.IsNullOrEmpty(token) && withToken is null)
+        // Whether via custom token or exiting one, we need to ensure user can be authenticated with the GH CLI
+        if ((token != null && withToken == null) || await base.ExecuteAsync(context, settings) is not 0)
         {
-            AnsiConsole.MarkupLine(":cross_mark: [yellow]Invalid GitHub token provided[/]");
+            AnsiConsole.MarkupLine(":cross_mark: [yellow]GitHub CLI auth status could not be determined[/]");
             return -1;
         }
 

src/Commands/Process.cs

@@ -52,6 +52,8 @@ static bool TryExecuteCore(string program, string arguments, string? input, out
             output = output.Trim();
             if (string.IsNullOrEmpty(output))
                 output = null;
+            if (output == null && gotError && !string.IsNullOrWhiteSpace(error))
+                output = error.Trim();
 
             return !gotError && proc.ExitCode == 0;
         }